Hello Pradeep,
1. When you define the queue only for the SAP_APPL then you are asked to include the CRT packages (IS-PS-CA component).
So you have to include this component also in the queue. I thing upto now we are good.
Dont get confused by the terms prerequisites and CRT. Meeting prerequisite is mandatory..but we need the CRT packages only if there is a conflict. For Eg. in our case IS-PS-CA have conflict. We would not have faced this if it was not in our system. This is why SAP recommends to apply the SPS and not packages for components seperately.
2. When you define the queue for the IS-PS-CA packages....you receive not a valid queue...can you check the queue calculation log for this. Aslo you have to meet the prerequisites of the packages
recursively. There is no screenshot for the second part "Not a valid queue". Check the queue calculation for this.
I hope it helps.